Publishing a elevation layer into ArcOnline shifts it location

[EdHixson]

Hi there

Im uploading an elevation layer from ArcPro into ArcOnline. The data is in British National Grid and when it is uploaded it seems to shift from its loation. The example below shows it sitting north of a road in ArcPro and when uploaded into AGOL and viewed in Map Viewer it then seems to shift south of the same road

ArcPro

AGOL

Does anyone know why this is happening? I cant seem to figure out what is causing the shift. Is it potentially to do with the global elevation applied for the wider view?

ATB

-Ed

[EdHixson · Accepted solution]

Projection issue, define to BNG then back to WGS, OSTN15 conversion